maybees don't fly in June

It doesn't do any good to be so indecisive; quit thinking about hypothetical outcomes and make a decision. A pun on "maybe" and "bees," which are most prevalent in the summer months. A: "I think I prefer green, but maybe blue would be a better color for this room." B: "Look, maybees don't fly in June. Just pick one."

Stop changing your mind so much. “Maybees” is a pun on “maybes,” as in “If I do X, then maybe Y will happen, but if I don't do X, then maybe Z will happen . . . I just can't decide.” When someone used to hesitate in such a fashion, someone else would be sure to pipe up with the reminder that “maybes don't fly in June.”